On Dec 9, 2005, at 8:56 AM, Don Brown wrote:
I have used this method on 3 or 4 of the K2's I have built. I use a
1pF or
2pF NPO cap to lower the bottom end of the range to get it to meet
the spec.
I agree with you on pulling the crystal much with this method. I
would not
recommend cap values above maybe 3 or 4 pF. I have never needed
more than 1
pf. Padding C173 and C174 is a better method if the radio needs
more than 1
or 2 pf. I believe this method was suggested by Gary at Elecraft
some time
back. At any rate it is a little easier to do than the padding or
change out
of C174 and C173
To get the BFO range I needed for RTTY, not only did I have to pad
C173 and 4, but after I had added maximum capacitance there, I went
ahead and added 2 pF to pull the crystal. I have not noticed any
stability problems, and the BFO range is just about perfect.
Bill Coleman, AA4LR, PP-ASEL Mail: [EMAIL PROTECTED]
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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